head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
An endless runner about a jumping dinosaur avoiding obstacles.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Dino Game leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Game
Simple reflex-based jump/duck timing
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Dino Game
No opponents present
Half-Life 2
Combine AI scripted, non-adaptive.
Dino Game leans a little harder on variance, though the gap is small.
Dino Game
Obstacle spawn randomness varies runs
Half-Life 2
Almost no randomness.
Half-Life 2 leans a little harder on optimization, though the gap is small.
Dino Game
Minimal systems, mostly reflex-based
Half-Life 2
Linear progression with no builds.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.